You are not a big company with lots of developers and you do this voluntarily. In my opinion it's perfectly reasonable for you to only maintain one version.

If someone is desperate for the "old" version, they can always get a copy from someone else or pull it out of git and compile it.

(Have you ever considered a Gradle build script? If you use the wrapper, it's easy for people to compile because they only need a JDK and JAVA_HOME set -- Gradle will download itself and build the project).

Hi thanks for this advice. I have tried gradle and was able to change the file structure and create a usable OR directory running one line.

I think about using it, but there are also arguments against it and I still ponder if I really want a new dependency/tool in this project.Building is as simple as exporting to a runable JAR in the moment. Ok it requires eclipse, but most Java programmers will use it anyway.